Vacuum pyrolysis of commingled plastics containing PVC I. Kinetic study

Miranda, Rosa; Yang, Jingzhen; Roy, Christian; Vasile, Cornelia

doi:10.1016/s0141-3910(01)00048-9

Cited by 108 publications

(40 citation statements)

References 61 publications

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“…The lowering in the activation energy for all mixtures compositions were corresponding to the lower degradation temperature, mentioned previously. This was also reported by Miranda et al [14] that for the PP/PE mixture, PP caused a reduction of the activation energy. They explained in their work that free radicals were initially formed from the less stable polymer, which was PP in this case, due to a transfer of hydrogen.…”

Section: Kinetic Parameters Analysis For Thermal Degradation Of Posupporting

confidence: 84%

Kinetic Analysis of Thermal Degradation of Polyolefin Mixtures

Murichan¹,

Cherntongchai²

2014

IJCEA

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Abstract-Plastic wastes are a global concern for their environmental impacts. A proficiency method for plastic waste management is a chemical recycling through a pyrolysis process. In this work, kinetic analysis of thermal degradation of polyolefin mixture between polypropylene (PP) and low density polyethylene (LDPE) under pyrolysis atmosphere at different compositions was investigated using thermogravimetric analysis (TGA), operated non-isothermally. Besides, Vyazovkin model-free method, together with different temperature integral approximation approaches, was used for kinetic parameter analysis from TGA results. It was found that thermal degradation process of polyolefin mixture was a triple step process and an addition of PP reduced degradation temperature. Besides, different approximation approaches did not affect activation energy value. For polyolefin mixture, the activation energy was increased initially, constant intermediately and finally increased again with increasing conversion. Finally, the activation energy of the polyolefin mixture was lower than those of pure polymers and decreased with increasing PP fraction.

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Section: Kinetic Parameters Analysis For Thermal Degradation Of Posupporting

confidence: 84%

Kinetic Analysis of Thermal Degradation of Polyolefin Mixtures

Murichan¹,

Cherntongchai²

2014

IJCEA

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“…This suggests that these plastics devolatilize without interaction. Miranda et al [30] studied the vacuum devolatilization of a PE/PVC mixture and also reported similar observations. Comparison of the experimental curve and the calculated curve for PVC/PU mixture shows a higher amount of char left compared to what has been calculated.…”

Section: Devolatilization Of Mixed Plasticsmentioning

confidence: 57%

“…Current study shows that the studied plastics decompose differently, and mixing would result in tailored properties. Several researchers have studied the mixture of plastics and have reported their possible interaction [30,31]; therefore, the mixture of plastics is studied. Binary mixtures of PE/PU, PE/PVC, and PU/PVC with the weight proportions of 1:1 were investigated.…”

Section: Devolatilization Of Mixed Plasticsmentioning

confidence: 99%

Alternative Reducing Agents in Metallurgical Processes: Devolatilization of Shredder Residue Materials

Lotfian

Ahmed

Samuelsson

2016

J. Sustain. Metall.

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Plastic-containing shredder residue material has the potential to be used as an alternative reducing agent in nonferrous bath smelting processes. This would lead to not only decreased dependency on primary sources such as coal or coke but also to an increase in the efficiency of utilization of secondary sources. This calls for systematic scientific investigations, wherein these secondary sources are compared with primary sources with respect to devolatilization characteristics, combustion characteristics, reactivity, etc. As a first step, in this paper, devolatilization characteristics of plastic-containing shredder residue material (SRM) are compared to those of coal using thermogravimetric analysis. Proximate analysis has shown that SRM mainly decomposes by release of volatiles, while coal shows high fixed carbon content, which is reported to contribute to reduction reactions. To study the reduction potential of the evolved materials, composition of evolved off-gas was continuously monitored using quadrupole mass spectroscopy. The composition of volatiles shows H 2 , CO, and hydrocarbons which are known to have reduction potential. Therefore, it is essential that SRM would be used in a process that could utilize the evolved volatiles for reduction. Furthermore, to understand the potentials of different plastic materials as reducing agents, the devolatilization mechanisms and volatile composition of three common plastics, namely, polyethylene, polyurethane, and polyvinylchloride and their mixtures have been studied. The results show the interaction between the plastics within the binary and ternary mixtures. Similar phenomena may occur during devolatilization of SRM, which contains different type of plastics.

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“…In any case, many discrepancies can be found in literature data between the same polymers (usually virgin/commercial polymers) that arise scattered and inconsistent because of the different samples (different manufacturing processes and eventual presence of additives) and different experimental conditions and methodology used [22]. Finally, limited literature is available on the degradation of plastic mixtures (essentially studies on binary or tertiary systems) and their kinetics [12,13,[23][24][25][26][27][28], particularly using the model free approach [29,30]. The majority of these studies are based on accurate knowledge of qualitative and quantitative composition of the synthetic tested mixtures, but this kind of approach is not suitable to investigate real unknown matrices.…”

mentioning

confidence: 99%

“…The thermal behavior of single plastic components regarding degradation is the basis for understanding the pyrolysis of commingled plastics, since the absence (or presence) of interactions among the components in a synthetic or real mixture should be revealed by the fact that at each given temperature the overall degradation rate of the mixture is equal (or not) to the weighed sum of the degradation rates of the components. The degradation peak temperature (corresponding to the peak temperature of the first-order derivative of TG, DTG) and the apparent activation energy (E a ) of degradation were analyzed in order to evaluate if interactions among polymers occur during pyrolysis and to determine the first parameters for the set-up and the scale-up of a pyrolysis process on these plastic wastes [24,29]. As stated previously, only few authors used model free methods to study degradation processes in plastic mixtures.…”

mentioning

confidence: 99%